Hello,
As a client, I want to participate in designing the floor plan for a passive house myself. Besides being able to illustrate basic furnishings (stairs, kitchen, WC, bed, etc.) in the plan, I especially want to perform at least an approximate cooling load calculation. The motivation is to estimate the effort required for surface cooling (on the ceiling) in selected rooms.
For a start, the software mh-BIM Starter, formerly TGA-Tools, seems to be a good choice. However, in the basic version, I miss both the mentioned interior models and especially the cooling load calculation.
- Can anyone recommend free and well-organized DWG / DXF libraries to add basic interior elements?
- What options are available for cooling load calculations besides the commercial extensions of mh-BIM?
Thank you
Andreas
As a client, I want to participate in designing the floor plan for a passive house myself. Besides being able to illustrate basic furnishings (stairs, kitchen, WC, bed, etc.) in the plan, I especially want to perform at least an approximate cooling load calculation. The motivation is to estimate the effort required for surface cooling (on the ceiling) in selected rooms.
For a start, the software mh-BIM Starter, formerly TGA-Tools, seems to be a good choice. However, in the basic version, I miss both the mentioned interior models and especially the cooling load calculation.
- Can anyone recommend free and well-organized DWG / DXF libraries to add basic interior elements?
- What options are available for cooling load calculations besides the commercial extensions of mh-BIM?
Thank you
Andreas
X
xMisterDx13 Mar 2023 23:00HoisleBauer22 schrieb:
I also gave up planning with a €130 software (Good luck. see my thread about house planning software…). It’s not worth the effort since the architect can’t use the data afterwards. Yes. We gave up as well on having an electrician draw the wiring diagrams and a chef design the mechanical installation.
Since we let the respective professionals handle those tasks, everything works quite well.
You don’t save the professional any work by clicking something together as a layperson without any knowledge. On the contrary.
xMisterDx schrieb:
Yes. But in winter, you simply don’t have the same amount of sunlight. It is significantly higher in summer.
Therefore, you cannot just take the heating calculation and reverse the sign of the solar radiation; he is correct about that. Good heavens, I’m not even sure whether you don’t understand mathematics or physics here. And this has nothing to do with the seasons. This is not about signs at all.
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First of all, thank you for the numerous responses and comments.
Regarding the calculation of the cooling load: My main concern is not how much less I have to heat in winter due to solar radiation, but rather how much additional cooling I need in summer to prevent the indoor temperature from exceeding a certain level throughout the day.
To put it bluntly, it can make a big difference whether I have to heat with about 10 W/m² (approximately 1 W/ft²) in the coldest winter in a passive house, or whether in midsummer direct solar radiation of over 100 W/m² (approximately 9 W/ft²) causes the building to heat up.
Regarding the calculation of the cooling load: My main concern is not how much less I have to heat in winter due to solar radiation, but rather how much additional cooling I need in summer to prevent the indoor temperature from exceeding a certain level throughout the day.
To put it bluntly, it can make a big difference whether I have to heat with about 10 W/m² (approximately 1 W/ft²) in the coldest winter in a passive house, or whether in midsummer direct solar radiation of over 100 W/m² (approximately 9 W/ft²) causes the building to heat up.
Frosti42 schrieb:
having to heat in the coldest winter with about 10 W/m² in a passive house, or having direct solar radiation of more than 100 W/m² in midsummer heating up the building. That was part of our heating load calculation, considering the solar gains through all window areas for each month, and the calculated values were quite high.
Frosti42 schrieb:
Regarding the calculation of cooling loads. Practically, I am not so much interested in how much less I need to heat due to solar gains in winter, but rather how much additional cooling is required in summer to keep the indoor temperature below a certain level throughout the day.
To put it bluntly, it can make a big difference whether I need to heat with about 10 W/m² (3.1 BTU/h·ft²) in deep winter in a passive house, or if in high summer direct solar radiation of over 100 W/m² (31 BTU/h·ft²) heats up the building.
There are calculation methods for this, for example according to DIN 4108-2, which can be used to determine the summer cooling loads to be removed. As far as I know, software support for this is available from the same programs that handle heating load calculations and the preparation of thermal insulation certificates, calculations, and energy performance certificates.
Common examples include Hottgenroth (with numerous add-ons, including CAD extensions, typical architect software) and the BKI Energieplaner (more focused on energy applications, with less user-friendly graphical output and more cumbersome data entry).
Frosti42 schrieb:
but rather how much additional cooling is needed in summer to keep the indoor temperature from exceeding a certain level throughout the day.Comparison in a car, 1. Automatic climate control runs at full power to reach 22°C (72°F), which is far from comfortable.
2. Or manually set to level 1, running slowly, without draft, achieving a comfortable temperature that adjusts itself depending on the heating load.
We always choose option 2.